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• Design leaderboard ratings for quiz games

  - by PeterK

  Back in March 2011 i started the following post: How to design a leaderboard? Now my quiz game have been out for approximately a year and sold pretty decently. I am working on to update the game design and is again looking into the leaderboard design to make it better as i am not happy with it. Currently i rate players on number of correct answers, which is not good as it does not consider things like number of games, difficulty levels etc. I also have "extended" stats behind the UITableView (Leaderboard). A player can play based on three levels of difficulty: hard, medium or easy Difficulty levels can be mixed between players in a game Each game can be one to six players, so there can be single games or duels Between 2 and 30 questions per game As i am considering integrating Game Center Leaderboard i need to design a better rating system so i would like to ask for some ideas how to do the rating based on the above. I am thinking about how much a point would be worth and what it includes.

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• How To Check If Your Account Passwords Have Been Leaked Online and Protect Yourself From Future Leaks

  - by Chris Hoffman

  Security breaches and password leaks happen constantly on today’s Internet. LinkedIn, Yahoo, Last.fm, eHarmony – the list of compromised websites is long. If you want to know whether your account information was leaked, there are some tools you can use. These leaks often lead to many compromised accounts on other websites. However, you can protect yourself by using unique passwords everywhere – if you do, password leaks won’t be a threat to you. Image Credit: Johan Larsson on Flickr 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• GPU based procedual terrain borders?

  - by OnePie

  I'm working on a game that preferibly should feature a combination of designed and procedually generated terrain where the designer specifies in somewhat detailed terms what type of terrain a given area will have (grasslands, forest etc...) and then a precedual algorithm takes care of the rest. I'm not talking about minecraft style biomoes, but rather the game map for a strategy game. Each 'area' will not take up that much of the screen, and thus be more akin to a tile whose texture is procedually generated. While procedually generating terrain textures on the GPU are not that difficult, the hard part is making the borders between them look good. Currently, the 'tiles' are large enough to be visible (due to memory constraints mainly, we are talking planetary sized textures for a game taking place in space and on a continental ground view with seamless transitions between them) and creating good borders between them with an algorithm that is fast enough to be useful has proven difficult. Sampling the n-surrounding pixels and using the combiened result did not yield very good borders and was fairly slow on the GPU to boot (ca 12ms for me, that is without any lighning or shading and with very simple terrain texture shaders). So are there any practical known methods to solve this problem?

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• Why does my computer just keep restarting while trying to install Ubuntu 13.04 (x86) from USB alongside Windows 7?

  - by Sumit Chahal

  I have checked the other questions, but none of them match my problem (the ones that do don't have satisfactory answers). I downloaded the Ubuntu 13.04 iso and burned it to my USB device following the given instructions. I was also able to boot the Ubuntu setup from it by changing the boot sequence so that the USB device is now at the top. But I am only able to use the "trial" version of Ubuntu. Every time I tick "Install Ubuntu alongside Windows" and click "Continue", the computer just restarts and I see the same Try-Ubuntu-or-install-it menu. I have tried pressing any key when that little icon appears at the bottom, but it is not at all helpful. I also read somewhere that I should eject my USB device after I click "Continue", but doing so just makes the computer run Windows 7 instead.

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• how to replace windows 7 completely and repair grub

  - by sud

  I am trying to install ubuntu on HP probook 4530s x64 system. there is windows 7 already installed and i want to remove it. so i format C:\ drive and make to partation \ (sha2) and swap (sha4) from it. there is also a partation sha1 (300mb) for MBR (don't know what is it) i just leave it. after some time i get fatal error unable to install grub. and so i choose partation sha1 when it ask. no at boot time there is option to choose windows 7. and not for ubuntu and windows is also removed. i also try to install grub form other answers but no success. how to replace windows completely and where to install grub and what to do with 300mb (MBR).

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• How and when is old-releases.ubuntu.com updated?

  - by muru

  The old-releases.ubuntu.com mirror hosts the repositories for EOL Ubuntu releases. The main page currently lists up to 11.10 (or 12.04.3 if you count point upgrades), but the dists page lists up to 13.04. Why the discrepancy? When will the main page be updated? When will the newest EOL release (13.10) be shifted here? I'd like documentation backing up answers, please. Priority of documentation: Statements by Mark Shuttleworth (on his blog or other public statements) Pages from the Official Ubuntu documentation Ubuntu mailing list discussions, Launchpad bug reports (or questions) or blueprints, etc. IRC discussion logs for official Ubuntu channels Random gossip on the street Community Wiki.

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• Create a custom shortcut that types clipboard contents

  - by briankb

  I want to paste my clipboard contents to a remote session such as VNC, IPMI, or Raritan. To accomplish this, I installed xdotool and clip. Then I wrote a simple command that types the clipboard contents: xdotool type "$(xclip -o)" This works if I stay in a terminal window, and type that command myself. It types back my clipboard contents when I run the command. Of course now I want to make this into a hotkey that works in any window. However, if I create a custom shortcut using Keyboard settings, it doesn't work. If I assign a hotkey Alt+K to the shortcut, nothing happens when I press it. If I use Ctrl+K, unexpected behavior occurs to whatever window has focus. e.g. my terminal window size shrinks (it's somewhat amusing, actually). Similar results occur if I save it as a script and call the script, or if I encapsulate the command with sh -c. How can I make practical use of the powerful xdotool type command?

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• How to change careers

  - by Jack Black

  For the past 4 years I have worked in c# doing web development. I have really enjoyed it, learnt a lot and have a worked hard to get to a position where I am earning good money and enjoy the work. However lately - I have wanted a change. What with the "native renaissance" I would like to change my career from being high level application and web development to more down to the metal native development. I haven't done any c or c++ since Uni over 4 years ago and so I have begun reading text books and websites to brush up. However - one major issue I have is that I have no practical experience with C++ and although I am brushing up on it, there will be a lot I don't know. Most of the jobs I have seen in native code around me all require native experience. The only positions I can find that don't explicitly ask for native experience are junior level positions. In my current role I am a mid level developer and although there would be a lot to learn in a c++ position, I wouldn't class myself as a junior. I guess my question is, how do people solve this issue when changing programming languages for their profession and / or how would you approach this hurdle? Like I said, I would really like to try out native development professionally but I wouldn't want to move back to a junior role. Would employers consider years of managed development and native hobby projects enough experience?

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• How to write a network game?

  - by TomWij

  Based on Why is so hard to develop a MMO?: Networked game development is not trivial; there are large obstacles to overcome in not only latency, but cheat prevention, state management and load balancing. If you're not experienced with writing a networked game, this is going to be a difficult learning exercise. I know the theory about sockets, servers, clients, protocols, connections and such things. Now I wonder how one can learn to write a network game: How to balance load problems? How to manage the game state? How to keep things synchronized? How to protect the communication and client from reverse engineering? How to work around latency problems? Which things should be computed local and which things on the server? ... Are there any good books, tutorials, sites, interesting articles or other questions regarding this? I'm looking for broad answers, but specific ones are fine too to learn the difference.

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• User prompts (MessageBox) with MVVM

  - by mukapu

  The problem statement: I am tired of thinking how to show a simple message box or user prompt and act based on the response in Model-View-View-Model (MVVM). Common approaches: - It's ok, let's just do this one thing from ViewModel and mock this out for unit testing - Design my own dialog, then what to do from there - Can I write something in view code behind, ah yes, that seems to be the only way out, as anyway MVVM is still not matured...  - and what not?   I am pretty much one among the few frustrated out in this world looking for some convincing answers. I think we can do it a little neater without having the feeling of violating any of our self defined rules! Solution: The Control - Implement a simple control with no designer visibility. - Allow a property to be bound to tell when to show the MessageBox - Provide command binding for possible user actions, Yes, No, Cancel... How do I Use? - Just place the necessary XAML tags in the view - Implement the command for all user actions in the View Model - Run unit tests on the commands

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• Up, down, right arrow keys and delete key not working

  - by user210780

  I have already read Delete and arrow keys not working and tried what is written there. I have also tried restarting my computer. I have also searched elsewhere for answers, but I haven't found any solution. I am using Ubuntu 12.04, and there were not problems yesterday, but for the last hour, I've had the following problem. When I press the up or the right arrow, nothing happens. When I press the down arrow, it doesn't make anything go down, but something appears in the upper right corner of my screen: http://i.imgur.com/pmnFOCD.png When I press the delete key, nothing gets deleted, but something appears in the upper right corner of my screen: http://i.imgur.com/Wu9czel.png The left arrow still works. Can anybody help me get my three arrow keys and delete key back?

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• generating maps

  - by gardian06

  This is a conglomeration question when answering please specify which part you are addressing. I am looking at creating a maze type game that utilizes elevation. I have a few features I would like to have, but am unsure as to some of the implementation. I have done work doing fileIO maze generation (using a key to read the file, and then generate the level based on that file), but I am unsure how to think about this with elevation in the mix. I think height maps might be a good approach, but don't know how to represent them effectively. for a height map which is more beneficial XML(containing h[u,v] data and key definition), CSV (item1 is key reference, item2 is elevation), or another approach that I have not thought of yet? When it comes to placing the elevation values themselves what kind of deltah values are appropriate to have it noticeable at about a 60degree angle while not really effecting gravity driven physics (assuming some effect while moving up/down hill)? I am thinking of maybe going to procedural generation at some point, but am wondering if it is practical to have a procedurally generated grid (wall squares possibly same dimensions as the open space squares), or if designing to a thin wall open spaces is better? this decision will effect the amount of work need on the graphics end for uniform vs. irregular walls. EDIT: game will be a elevation maze shooter. levels/maps will be mazes with elevation the player has to negotiate. elevations will have effects on "combat" vision, and movement

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• Why is cleverness considered harmful in programming by some people?

  - by Larry Coleman

  I've noticed a lot of questions lately relating to different abstraction techniques, and answers saying basically that the techniques in question are "too clever." I would think that part of our jobs as programmers is to determine the best solutions to the problems we are given to solve, and cleverness is helpful in doing that. So my question is: are the people who think certain abstraction techniques are too clever opposed to cleverness per se, or is there some other reason for the objection? EDIT: This parser combinator is an example of what I would consider to be clever code. I downloaded this and looked it over for about half an hour. Then I stepped through the macro expansion on paper and saw the light. Now that I understand it, it seems much more elegant than the Haskell parser combinator.

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• Recommended 2D Game Engine for prototyping

  - by Thomas Dufour

  What high-level game engine would you recommend to develop a 2D game prototype on windows? (or mac/linux if you wish) The kind of things I mean by "high-level" includes (but is definitely not limited to): not having to manage low-level stuff like screen buffers, graphics contexts having an API to draw geometric shapes well, I was going to omit it but I guess being based on an actual "high-level" language is a plus (automatic resource management and the existence a reasonable set of data structures in the standard library come to mind). It seems to me that Flash is the proverbial elephant in the room for this query but I'd very much like to see different answers based on all kinds of languages or SDKs.

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• Control external monitor brightness

  - by remi

  Hello Ubuntu community, I can control the brightness of my DELL U2713HM connected with DisplayPort via the command: ddccontrol -p -r 0x10 -w 53 where in this example the number 53 represents the brightness level (range 0 to 100). But I don't know how to link the command to my brightness keys on my keyboard. I searched already, but just found answers to integrated laptop screens. In /sys/class/backlight is the folder acpi_video0 with some subfolders and files. The file actual_brightness contains a number from 0 to 20, which is changing when I press the brightness keys. How do I get my external monitor listed as a device in /sys/class/backlight ? PS: I am running a fresh Ubuntu 12.10 install with integrated graphics Intel HD4000.

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• I have lost sudo privileges in Ubuntu 13.04 [duplicate]

  - by Fredca

  This question already has an answer here: How do I add myself back as a sudo user? 3 answers I have lost sudo privileges in Ubuntu 13.04 these are the responses I get user@user-desktop:~$ sudo sudo: effective uid is not 0, is sudo installed setuid root? user@user-desktop:~$ groups user user : user adm cdrom sudo dip plugdev lpadmin sambashare user@user-desktop:~$ su user Password: su: Authentication failure user@user-desktop:~$ who am i user pts/0 2013-10-24 08:54 (:0.0) user@user-desktop:~$ why can't I invoke sudo if one of my groups is sudo? also I have noticed that /etc/sudoers needs sudo privileges. sudoers.so doesn't exist in /usr/lib but does in /usr/lib/sudo is this correct in 13.04? Please note that the user is already a member of both sudo and adm groups.

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• Strategy for versioning on a public repo

  - by biril

  Suppose I'm developing a (javascript) library which is hosted on a public repo (e.g. github). My aim in terms of how version numbers are assigned and incremented is to follow the guidelines of semantic versioning. Now, there's a number of files in my project which compose the actual lib and a number of files that 'support it', the latter being docs, a test suite, etc. My perspective this far has been that version numbers should only apply to the actual lib - not the project as a whole - since the lib alone is 'the unit' that defines the public API. However I'm not satisfied with this approach as, for example, a fix in the test suite constitutes an 'improvement' in my project, which will not be reflected in the version number (or the docs which contain a reference to it). On a more practical level, various tools, such as package managers, may (understandably) not play along with this strategy. For example, when trying to publish a change which is not reflected in the version number, npm publish fails with the suggestion "Bump the 'version' field set the --force flag, or npm unpublish". Am I doing it wrong?

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• apt-get update error - binary-i386, binary-amd64 [duplicate]

  - by magamig

  This question already has an answer here: How can I fix a 404 Error when updating packages? 5 answers When I run: sudo apt-get update It shows me the following error: W: Failed to fetch http://ppa.launchpad.net/directhex/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ppa.launchpad.net/directhex/ppa/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. I have googled for solutions, but none of what I found, have worked for me. Please give me your suggestions

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• SQL Saturday #220 Atlanta May 2013!

  - by Most Valuable Yak (Rob Volk)

  If you love SQL Server training and are near the Atlanta area, or just love us so much you're willing to travel here, please come join us for: SQL SATURDAY #220! The main event is Saturday, May 18.  The event is free, with a $10.00 lunch fee.  The main page has more details here: http://www.sqlsaturday.com/220/eventhome.aspx We are also offering pre-conference sessions on Friday, May 17, by 5 world-renowned presenters: Denny Cherry: SQL Server Security Register! Site Twitter Adam Machanic: Surfing the Multicore Wave: Processors, Parallelism, and Performance Register! Site Twitter Stacia Misner: Languages of BI Register! Site Twitter Bill Pearson: Practical Self-Service BI with PowerPivot for Excel Register! Site Twitter Eddie Wuerch: The DBA Skills Upgrade Toolkit Register! Site Twitter         We have an early bird registration price of $119 until noon EST Friday, March 22.  After that the price goes to $149, a STEAL when you compare it to the PASS Summit price. :) Please click on the links to register and for more information.  You can also follow the hash tag #SQLSatATL on Twitter for more news about this event. Can't wait to see you all there!

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• Can not enter password for sudo [duplicate]

  - by Michael

  This question already has an answer here: add repository to ubuntu from terminal with pgp key 3 answers I have used Ubuntu for several years, and I can not enter password for sudo, and this is when i wanna add a key to public.gpg for itunes10 it dos not work, and the password normal works wite sudo but not in the terminal when i enter: sudo wget -q "http:// deb.playonlinux.com/public.gpg" -o- | sudo apt-get add - and it says this 'sorry try again', and i just had installed itunes10, and have to add a key whit wget to public.gpg, and i tried to enter in the terminal: sudo apt-get update and the password works fine but not whit using sudo wget, and can some one please help.

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• How does a government development shop transition to developing open source solutions?

  - by Rob Oesch

  Our shop has identified several reasons why releasing our software solutions to the open source community would be a good idea. However, there are several reasons from a business stand point why converting our shop to open source would be questioned. I need help from anyone out there who has gone through this transition, or is in the process. Specifically a government entity. About our shop: - We develop and support web and client applications for the local law enforcement community. - We are NOT a private company, rather a public sector entity Some questions that tend to come about when we have this discussion are: We're a government agency, so isn't our code already public? How do we protect ourselves from being 'hacked' if someone looks into our code? (There are obvious answers to this question like making sure you don't hard code passwords, etc. However, the discussion needs to consider an audience of executives who are very security conscience.)

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• Will having a website duplicated on multiple top level domains be penalised by search engines [duplicate]

  - by user1020317

  This question already has an answer here: Will having multiple domains improve my seo? 7 answers I'm running a website for a global company, and although we rank first in search engine results here in Ireland, a search done from other countries doesn't rank us as highly. If I register the domain at other top level domain names (eg. example.co.uk, example.nor etc.) and then just mirror the .com site to those other domains, will I be penalised by search engines for having duplicate content? Has anyone else faced a similar problem and found a way to capture the global search engine? Thanks.

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• Come visit us at OOW 2012 B2B Demo Booth!

  - by Nitesh Jain

  You’re invited to visit us at the Oracle B2B Demo POD at Oracle OpenWorld and JavaOne 2012. Please stop by at our booth to see cool demos on EDI X12, EDIFACT and SBRES (used in Airlines industry). We will also be showing integration with OSB, SOA Suite and BAM. Use this opportunity to see the product in action, learn, and get answers to your questions. We will be happy to meet you and hear about your B2B integration usecases and discuss our roadmap. The demo pod will be available at the Fusion Middleware Demo POD area on Monday, October 1 through Wednesday, October 3, 2012. Look forward to seeing you there! Happy OOW 2012! Ref: https://blogs.oracle.com/SOA/entry/come_visit_us_at_oow

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• Stuck on busybox after a fresh install

  - by user54841

  I installed 11.10 and was getting stuck on Busybox unless I type exit. After grabbing the latest updates it then didn't get stuck on busybox but instead on a black screen of nothingness. I've now reformatted and started again using the exit technique for the time being. I had a search here before posting and none of the answers gave much insight, other than it 'could be a gfx card driver issue'. I'm using new hardware that has no issues with Mint, Win7 or WinXp. BUT note, I'm not dual booting, its a complete fresh install formatting the entire drive. Any help is appreciated as I'd really like to get stuck into Ubuntu. Thanks in advance. -Luke

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• How do I create a new usergroup?

  - by Sergiu

  I want to do this because I'm trying to fix user permissions from Ubuntu on my Mac OS X partition and Ubuntu doesn't have the "wheel" group that I so desperately need! Please don't trash me for this but I set my whole Mac OS X partition to give read and write access to everyone so I could access and modify everything on it from my dual-booting Ubuntu OS, and now everything is screwed... I don't have the original Mac OS X installation DVD and booting a Mac OS X 10.5.6 DVD gives me kernel panics... The OS installed on that Mac partition is 10.4.11. Is there any hope for me to ever fix it? I don't have money to buy utilities, and I can't use AppleJack either because my permissions are so messed up... None of the posted answers are what I wanted to do. I wanted to add fields to a user that was on my Mac partition, not a user part of the Ubuntu groups. Is that possible?

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